Earth’s climatic transition from the Last Glacial Maximum (LGM) to the Holocene is still not fully understood. The associated rise in atmospheric CO2 remains unexplained although it is important for the global warming. Ocean circulation changes during the deglaciation have been linked to the rates of CO2 increase. However, the exact mechanism of that link is unclear and quantifying changes in the ocean’s circulation and carbon storage remain challenging tasks.
This workshop will contribute to making progress through new regional syntheses of carbon isotope data throughout the last deglaciation and comparisons of these syntheses to other paleoclimate proxy reconstructions and isotope enabled model simulations. We plan to address questions such as the following:
- When, at what depths, and by how much did carbon isotopes start to change after the LGM in the Atlantic, Pacific, Indian, and Southern Oceans?
- What do these changes imply about ocean circulation?
- How much did the Atlantic Meridional Overturning Circulation (AMOC) decrease during Heinrich Stadial 1 (HS1)? Was it only weakened or completely shut-down?
- Are carbon isotopes consistent with the idea that an AMOC shutdown weakened the biological pump and triggered the initial CO2 rise during HS1?
- Why did CO2 concentrations during the subsequent Bolling-Allerod stay constant?
- What caused the CO2 rise during the final phases of the deglaciation?
- What role did changes in the Southern Ocean and North Pacific play?